[interpreter] Unify meaning of register count operands.

src/interpreter/bytecode-array-builder.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_
 #define V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_
 
 #include "src/ast/ast.h"
 #include "src/interpreter/bytecode-register-allocator.h"
 #include "src/interpreter/bytecodes.h"
@@ skipping 146 matching lines @@
       Handle<FixedArray> constant_properties, int literal_index, int flags);
 
   // Push the context in accumulator as the new context, and store in register
   // |context|.
   BytecodeArrayBuilder& PushContext(Register context);
 
   // Pop the current context and replace with |context|.
   BytecodeArrayBuilder& PopContext(Register context);
 
   // Call a JS function. The JSFunction or Callable to be called should be in
-  // |callable|, the receiver should be in |receiver| and all subsequent
-  // arguments should be in registers <receiver + 1> to
-  // <receiver + 1 + arg_count>.
-  BytecodeArrayBuilder& Call(Register callable, Register receiver,
-                             size_t arg_count, int feedback_slot);
+  // |callable|, the receiver should be in |receiver_args| and all subsequent
+  // arguments should be in registers <receiver_args + 1> to
+  // <receiver_args + receiver_arg_count - 1>.
+  BytecodeArrayBuilder& Call(Register callable, Register receiver_args,
+                             size_t receiver_arg_count, int feedback_slot);
 
   // Call the new operator. The |constructor| register is followed by
   // |arg_count| consecutive registers containing arguments to be
   // applied to the constructor.
   BytecodeArrayBuilder& New(Register constructor, Register first_arg,
                             size_t arg_count);
 
   // Call the runtime function with |function_id|. The first argument should be
   // in |first_arg| and all subsequent arguments should be in registers
-  // <first_arg + 1> to <first_arg + 1 + arg_count>.
+  // <first_arg + 1> to <first_arg + arg_count - 1>.
   BytecodeArrayBuilder& CallRuntime(Runtime::FunctionId function_id,
                                     Register first_arg, size_t arg_count);
 
   // Call the runtime function with |function_id| that returns a pair of values.
   // The first argument should be in |first_arg| and all subsequent arguments
-  // should be in registers <first_arg + 1> to <first_arg + 1 + arg_count>. The
+  // should be in registers <first_arg + 1> to <first_arg + arg_count - 1>. The
   // return values will be returned in <first_return> and <first_return + 1>.
   BytecodeArrayBuilder& CallRuntimeForPair(Runtime::FunctionId function_id,
                                            Register first_arg, size_t arg_count,
                                            Register first_return);
 
   // Call the JS runtime function with |context_index|. The the receiver should
-  // be in |receiver| and all subsequent arguments should be in registers
-  // <receiver + 1> to <receiver + 1 + arg_count>.
-  BytecodeArrayBuilder& CallJSRuntime(int context_index, Register receiver,
-                                      size_t arg_count);
+  // be in |receiver_args| and all subsequent arguments should be in registers
+  // <receiver + 1> to <receiver + receiver_args_count - 1>.
+  BytecodeArrayBuilder& CallJSRuntime(int context_index, Register receiver_args,
+                                      size_t receiver_args_count);
 
   // Operators (register holds the lhs value, accumulator holds the rhs value).
   BytecodeArrayBuilder& BinaryOperation(Token::Value binop, Register reg,
                                         Strength strength);
 
   // Count Operators (value stored in accumulator).
   BytecodeArrayBuilder& CountOperation(Token::Value op, Strength strength);
 
   // Unary Operators.
   BytecodeArrayBuilder& LogicalNot();
@@ skipping 194 matching lines @@
   size_t offset_;
 
   friend class BytecodeArrayBuilder;
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_